{rh-rhacm-first} manages clusters in a hub-and-spoke architecture, where a single hub cluster manages many spoke clusters. Hub clusters running {rh-rhacm} provision and deploy the managed clusters by using {ztp-first} and the assisted service that is deployed when you install {rh-rhacm}.
The assisted service handles provisioning of {product-title} on single node clusters, three-node clusters, or standard clusters running on bare metal.
A high-level overview of using {ztp} to provision and maintain bare-metal hosts with {product-title} is as follows:
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A hub cluster running {rh-rhacm} manages an {product-registry} that mirrors the {product-title} release images. {rh-rhacm} uses the {product-registry} to provision the managed clusters.
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You manage the bare-metal hosts in a YAML format inventory file, versioned in a Git repository.
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You make the hosts ready for provisioning as managed clusters, and use {rh-rhacm} and the assisted service to install the bare-metal hosts on site.
Installing and deploying the clusters is a two-stage process, involving an initial installation phase, and a subsequent configuration and deployment phase. The following diagram illustrates this workflow:
